ML20055E515

Requests Listed Addl Info on Licensee 900606 Plans Re Diesel Generator Operation as Peaking Power Supplies to Assure That Generators Will Be Maintained in Nondegraded Status

ML20055E515
Person / Time
Site:	Rancho Seco
Issue date:	07/03/1990
From:	Larkins J Office of Nuclear Reactor Regulation
To:	Keuter D SACRAMENTO MUNICIPAL UTILITY DISTRICT
References
TAC-76827, NUDOCS 9007120075
Download: ML20055E515 (3)

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UNITED STATES l'

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NUCLE AR REGULATORY COMMISSION c

f W ASHINGT ON, D. C. 20666 i

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July 3, 1990 Docket No. 50-312 Mr. Dan R. Keuter l

i Assistant General Manager, Nuclear Rancho Seco Nuclear Generating Station 14440 Twin Cities Road Herald, California-95638-9799

SUBJECT:

USE OF DIESEL GENERATOR SETS AS PEAKING POWER SUPPLIES AT RANCHO

'SECO (TAC NO. 76827)

We have received your June 6,1990 letter informing us of the Sacramento Munici >al Utility District's (SMUD plans regarding diesel generator operation i

as pea (ing power supplies.

l As discussed with your staff placing the diesel generators in a lay-up condition or operating the diesel generators would not require a license i

amendment or an exemption from the regulations provided that your evaluation per 10 CFR 50.59 determines that your proposed action is not an unrgviewed I

safety question. However, the diesel generators must be maintained in a nondegraded status.

To provide assurance that the diesel generators will be maintained in a nondegraded status, we request that you submit for our review the following

.information and that we have'the opportunity to discuss-this matter with you prior to operating the diesel generators as peaking power supplies:

1.

What preventive maintenance (PM) tasks and surveillances will be.

performed to maintain the diesel generators and their auxiliaries in a good functional, nondegraded condition and to enhance the reliability for daily peaking service, 2.

What are the PM tasks and'surveillances previously performed and required that will not be performed, 3.

What actions will be taken to return the diesel generators to nuclear service if the decision to decomission Rancho Seco is changed, i

4.

What comitments related to the diesel generators will or will not be performed prior to operating the diesel generators as peaking units, j

5.

What modifications, if any, are needed to use the diesel generators as peaking power supplies, and what are the imp 2 cts of the use of the diesel generators on the safety-related electrical system, l

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Mr. Dan R. Keuter 2.-

July 3, 1990 i

6.

What procedure changes are needed for a loss of offsite power event with one or more units synchronized to _the grid, 7.

Will extended operation of the diesel generators adversely impact the qualification of the diesel generators for nuclear service, i.e.,

qualification in accordance with IEEE-387?

i Sincerely, 1

M/

John T. Larkins, Acting Director Project Directorate Y Division of Reactor Projects III, IV, V and Special Projects Office of Nuclear Reactor Regulation cc: ' See.next page

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0FFICIAL RECORD COPY

. Document Name: _ RS 76827

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Mr. Ocn R. Keuter Rancho Seco Nuclear Generating L-i Station CC:

Mr. S. David Freeman Mr. John Bartus

' General. Manager Ms. JoAnne Scott Sacramento Municipal Utility District Federal Energy Regulatory Comitsion 6201 S Street - P. O. Box 15830 825 North Capitol Street, N. E.

Sacramento, California 95852-1830 Washington, D.C.

20425 Thomas A. Baxter, Esq.

Ms. Helen Hubbard

'Shaw, Pittman, Potts & Trowbridge P. O. Box 63 2300 N Street, N.W.

Suno), California 94586 Washington, D.C.

20037 Environmental Conservation Mr. Jerry Delezenski Organization l

Supervisor, Nuclear Licensing Suite 320 Rancho Seco Nuclear Generating Station 101 First Street J

14440 Twin Cities Road Los Altos, California 94022 L

Herald, California. 95638-9799 Ms. Jan Schori, General Counsel Sacramento Municipal Utility District Mr. Robert B. Borsum, Licensing 6201 S Street Representative P.O. Box 15830 L

Babcock & Wilcox Sacramento, California 95813 Nuclear Power Division 1700 Rockville Pike - Suite 525 Rockville, Maryland. 20852 Resident inspector / Rancho Seco c/o U.~S. N. R. C.

14440 Twin Cities Roao Herald, California 95638 Regional Administrator, Region V

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U.S. Nuclear Regulatory Comission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Mr. John Hickman Senior Health Physicist Environmental Radioactive' Management Unit Environmental Mar s ment Branch State Department of Health Services i

'714 P Street, Room 616 Sacrr..nto, California 95814 Sacramento County Board of Supervisors 700 H Street Suite 2450 Sacramento, California 95814 e

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